Devart.Data.Linq.ForeignKeyReferenceAlreadyHasValueException

[DomenicoFormoso]

I have this code:

Code: Select all

WegDataContext db = new WegDataContext();
Fornisceforniamo ff = new Fornisceforniamo();
ff=db.Fornisceforniamos.FirstOrDefault(u => u.Idf == _idf && u.Ida == _ida && u.Ids==_ids);
ff.Ida = textIdA.Text;
ff.u = dataAgg.Value;
ff.p = p.Valore(); //my component
ff.Ids = (int)textS.Tag;    
db.SubmitChanges();

(Ids, Ida and Idf They are Entity Key)

at the line: ff.Ids = (int)textS.Tag;
I get this the error: Devart.Data.Linq.ForeignKeyReferenceAlreadyHasValueException.
I read other posts but I can not figure out how to fix this

[Shalex]

Code: Select all

ff.Ids = (int)textS.Tag;

Ids, Ida and Idf They are Entity Key

1. ORM framework doesn't allow modifying a primary key member of an entity.

I get this the error: Devart.Data.Linq.ForeignKeyReferenceAlreadyHasValueException.

2. This error occurs before the main problem (1). Please send us a small test project with the corresponding DDL/DML script so that we can reproduce and investigate the issue.